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Catalyst with Cu being loaded for taking off waste gas containing HCN and its preparing method as well as application

A catalyst and application method technology, applied in the field of HCN removal, can solve the problems of limiting the popularization and application of catalytic combustion method, high cost, etc., and achieve the effects of reduced production cost, convenient operation and energy saving

Inactive Publication Date: 2003-12-24
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the catalysts used for catalytic combustion are mainly noble metal catalysts such as Pt, Rh, and Pd, and their high cost limits the further application of catalytic combustion in industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The Cu(NO 3 ) 2 3H 2 O dissolves in H 2 O, prepared as a 4% aqueous solution, and then in Al 2 O 3 (16 mesh, specific surface area 80m 2 / g) An equal volume of Cu(NO) was added to the carrier 3 ) 2 solution, immersed at room temperature for 12h. The prepared catalyst was dried at 150 °C for 5 h, calcined at 450 °C under air atmosphere for 4 h, and then calcined at 550 °C for 4 h. 2 Reduction in atmosphere for 5h to obtain the weight ratio Cu:Al 2 O 3 = 3.95:100 catalyst. The prepared catalyst was installed in the reaction furnace, and then the furnace temperature was raised to 150 ° C, and the mixture containing HCN (10 ppm), NH was passed through. 3 (50ppm), tar (1vol%), air (5vol%) and N 2 (as a balance gas), etc., the air velocity of the mixed gas is 10,000 / h. The outlet concentration of the gas detected at the reactor outlet: HCN is 1.68ppm (detection method: TJ36-79, i.e. isonicotinic acid-pyrazolone colorimetry); NH 3 It is 16ppm (detection method: T...

Embodiment 2

[0021] The Cu(NO 3 ) 2 3H 2 O dissolves in H 2 O, prepared as a 6.00% aqueous solution, and then in Al 2 O 3 (10 mesh, specific surface area 250m 2 / g) An equal volume of Cu(NO) was added to the carrier 3 ) 2 solution, immersed at room temperature for 12h. The prepared catalyst was dried at 140 °C for 1 h, calcined at 650 °C for 1 h in an air atmosphere, and then calcined at 300 °C for 1 h. 2 Reduction in atmosphere for 8h to obtain Cu:Al by weight 2 O 3 = 5.92:100 catalyst. The prepared catalyst was installed in a reaction furnace, and then the furnace temperature was raised to 300 ° C, and a mixture containing HCN (10 vol%), NH was passed through. 3 (10vol%), tar (1vol%), air (50vol%) and N 2 (as a balance gas), etc., the air velocity of the mixed gas is 20,000 / h. The outlet concentration of gas detected at the reactor outlet: HCN is 1.76ppm; NH 3 54ppm; tars 0.03vol%. NOx was not detected. The rest are the same as in Example 1.

Embodiment 3

[0023] The Cu(NO 3 ) 2 3H 2 O dissolves in H 2 O, prepared as a 5.00% aqueous solution, and then in Al 2 O 3 (40 mesh, specific surface area 162m 2 / g) An equal volume of Cu(NO) was added to the carrier 3 ) 2 solution, immersed at room temperature for 10h. The prepared catalyst was dried at 100 °C for 6 h, calcined at 500 °C for 2 h in an air atmosphere, and then calcined at 300 °C for 2 h. 2 Reduction in atmosphere for 8h to obtain Cu:Al by weight 2 O 3 = 4.94:100 catalyst. The prepared catalyst was installed in a reaction furnace, and then the furnace temperature was raised to 250 ° C, and the mixture containing HCN (1 vol%), NH was passed through. 3 (20vol%), tar (5vol vol%), air (40vol%) and N 2 (as a balance gas), etc., the air velocity of the mixed gas is 10,000 / h. The outlet concentration of gas detected at the reactor outlet: HCN is 1.65ppm; NH 3 83ppm; tars 0.17vol%. NOx was not detected. The rest are the same as in Example 1.

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Abstract

A carried Cu catalyst for removing the HCN contained waste gas contains Cu and Al2O3 in Wt ratio of (2.96-5.92):100. Its preparing process includes adding Cu(NO3)2 solution to Al2O3 carrier, immersing, drying, calcining and H2 reducing. Its application method includes loading said catalyst into reaction furnace, heating to 150-300 deg.C, introducing the mixed gas containing HCN, NH3, tar and air to said reaction furnace, and catalytic combustion. Its advantages are simple operation etc.

Description

Technical field: [0001] The invention belongs to a kind of method of removing HCN, specifically relates to a kind of using Cu-Al 2 O 3 A method for removing HCN-containing waste gas produced in the production process of carbon fiber by catalytic oxidation as a catalyst. Background technique: [0002] In the production process of polyacrylonitrile-based carbon fiber, the highly toxic gas HCN and harmful gas NH are inevitably generated 3 and tar and other waste gases, if they are directly discharged without treatment, it will inevitably cause serious environmental pollution, and even endanger the survival of animals and plants, especially the minimum lethal dose of HCN to humans is 1mg / kg body weight, which makes people exposed to 20ppm HCN in the air Poisoning within a few hours. Therefore, the study of HCN removal is of great significance for the development of carbon fiber industry and the protection of the ecological environment. [0003] At present, there are four mai...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/86B01J23/72B01J23/835
Inventor 凌立成张奉民李开喜吕春祥
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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